Rink at Rockefeller Center Plaza, The Mail address: 600 Fifth Ave., office 8, Bldg. 17, NY 10020; (212) 332-7655, fax (212) 332-7676. Rink between 49th-50th Sts., off Fifth Ave. Season: Oct.-Apr. Off-season phone: (212) 332-7600. Group rates. Multilingual. Subways: 1, 9, B, D, E, F, N, Q, R; Buses: M1, M2, M3, M4, M5, M6, M7, M27, M50, M104, Q32.